ryao

16 ms·

181.
by ryao 1y ago
You assume that the ECC is not already calculated when the data is in the cache (and the cache line is marked dirty). Caches in CPUs are often ECC protected, regardless of whether the memory has ECC pritection. The cache should already have
182.
by ryao 1y ago
This would also need a SPD programmer and possibly some additional SMT resistors, but it is possible in theory.
183.
by ryao 1y ago
People can learn this outside of school. People who learn English as a second language do. Forcing it on me as a child meant that I did not learn English properly, until well into my adulthood. I am a native speaker in my 30s and I am still
184.
by ryao 1y ago
Details on what is missing that a X11 server needs are here: https://github.com/vvaltchev/tilck/discussions/81
185.
by ryao 1y ago
As long as the VFS permits those calls to go to the filesystem driver, that is doable. A casual inspction of the documentation suggests that doing this will return an error from the syscall. I am not sure what a kernel driver calling the VF
186.
by ryao 1y ago
Upon seeing this, thoughts keep occurring to me such as: * “It could be fun to be the author of a block layer, VFS and an AHCI driver for SATA. NCQ support is a must if I do.” * “It could be fun to port ZFS: ztest and zdb, plus the us
187.
by ryao 1y ago
It is interesting, although the lack of multiuser support is unfortunate. I really hope that the author reconsiders his stance on multiuser support, even if it is merely to allow things like chmod/chgrp to set file ownership to other u
188.
by ryao 1y ago
I just noticed a typo in this. I should have written 128 bits, not 64 bits. Data transfers in dual channel DDR4 are 128-bits at a time.
189.
by ryao 1y ago
Reading level is ambiguous here. Are you referring to whether someone can read the book, comprehend what it says and discuss it, or whether they can do all of that without having their understanding of the English language rewritten? Young
190.
by ryao 1y ago
There is a difference between understanding a book’s contents and being able to read the book without having it rewrite your understanding of the English language such that you have no idea what is correct and incorrect because your grasp o
191.
by ryao 1y ago
That is partly due to artificial reasons and partly due to technical reasons. The artificial reasons would be that the 8200 MT/sec UDIMMs are overclocked. Notice how they run much slower if you do not enable XMP/EXPO, which simult
192.
by ryao 1y ago
People get plenty of this outside of school. If they get it in school too, they will always be confused, like I was.
193.
by ryao 1y ago
> it's English as used by native speakers I do not speak that way and I do not know anyone else who speaks that way. That said, being relatively average at English as a student because I was constantly confused by the literature I w
194.
by ryao 1y ago
English is my first language. However, I had an undiagnosed learning disability until college. That said, to name one example, I do not think an understanding of adverbs versus adjectives can develop effectively if one is constantly exposed
195.
by ryao 1y ago
> Are you being sarcastic? I was serious. I cited Huckleberry Finn because it was the most egregious of the books that were forced on us, but it was by no means the only one. Many examples of incorrect grammar were normalized by books an
196.
by ryao 1y ago
When I was young, I was amazed at how they would try to teach us English grammar and spelling, then have us read books like Huckleberry Finn that undid 6 months to a year worth of English language education. When you are young and you do no
197.
by ryao 1y ago
You can calculate that using the deskew buffer sizes from here: https://www.ieee802.org/3/df/public/23_01/0130/ran_3df_03_23... That said, I fully expect such an order of magnitude difference to ove
198.
by ryao 1y ago
I feel like the application of “the market wants alternatives to Nvidia” to networking could turn out similarly to how “people want a physical keyboard” turned out in smartphones. In the networking market, Nvidia is the underdog. Anyone who
199.
by ryao 1y ago
The manufacturers chose this. Most customers were not offered a choice. It should be considered unethical to sell machines with non-ECC memory in any real volume.
200.
by ryao 1y ago
This is incorrect. ECC DIMMs are no slower than regular DIMMs. Instead, they have extra memory and extra memory bandwidth. A 8GB DDR4 ECC DIMM would have 9GB of memory and 9/8 the memory bandwidth. The extra memory is used to store the
201.
by ryao 1y ago
Nvidia implements ECC in software since they did not want to add the extra memory chip(s) needed to implement it in hardware to their boards. The only case where they do it in hardware is when they use HBM memory. That said, GDDR7 does on d
202.
by ryao 1y ago
I doubt anyone had a mental block against anything that was not Ethernet given that Infiniband had been taking market share from Ethernet since Nvidia acquired Mellanox in HPC if we go by the top 500 list: https://www.top500.org&
203.
by ryao 1y ago
This seems oddly appropriate: https://xkcd.com/927/ There is one difference, however. As far as I know, they did not make Ultra Ethernet because the existing Infiniband standard did not cover everyone’s use cases. They
204.
by ryao 1y ago
Infiniband is alive and well in HPC. 327 out of the top 500 machines use it according to this: https://www.top500.org/statistics/sublist/ It is a nice interconnect. It is a shame that the industry does not revisit
205.
by ryao 1y ago
I do not know exactly what is being done here, but I can say that I am aware of two techniques for sending bit streams over parallel wires while keeping the bits in order: 1. The lengths of all wires are meticulously matched so that signals
206.
by ryao 1y ago
The 64-bit kernel shipped for the Raspberry Pi 5 uses 16KB pages.
207.
by ryao 1y ago
I am not familiar with Android, but Linux ELF binaries that specify 4KB alignment will not work on systems with 16KB page sizes, since the ELF interpreter will refuse to load them. This hit me recently when trying to run a 32-bit binary on
208.
by ryao 1y ago
The lasagna is the electrolyte. The energy is contained in the metals.
209.
by ryao 1y ago
The most important word to know is 逃げろ. If you hear it, you will likely see others start running, and you should run in the same direction.
210.
by ryao 1y ago
As someone who has reviewed people’s résumés that they submitted with job applications in the past, I find it difficult to imagine this. The résumés that I saw had no racial information. I suppose the names might have some correlation to su

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